Retired serial-profiler Frank Black uses his ability to see into the twisted minds of killers to help others by joining the mysterious Millennium Group, a team of underground ex-law enforcement experts dedicated to fighting against the forces of evil.

Now retired and living in self-imposed exile in the world's most glamorous city, Poirot reluctantly attends a séance at a decaying, haunted palazzo. When one of the guests is murdered, the detective is thrust into a sinister world of shadows and secrets.